I have had to manually edit the html for my information pages. This due to a really extensive HTML write out by the WYSIWYG editor. It is kinda like it takes what the CSS says, and then puts it in html. But worse.

The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.

This due to a really extensive HTML write out by the WYSIWYG editor.
Well, you did not mention, if you created your Code in the SOURCE View or
in the Wysiwyg View, wich would be comparable to entering plain HTML Code
onto a MS FrontPage Wysiwyg Screen.

Otherwise, the unfamous OC-2/3 Editor, as well as some older ckEditors, had
some problems with changing SOURCE, when saving the Content in OC. And
it also depends on, wich way one saves the Code, if saved in Source Mode, some
keep the format, as entered, but it always has been a trail & error Game, to recall,
with Editor I used before, to avoid such problems, when, by example, adding a simpleclass="img-responsive" Code to an image/banner source, to make it look swell
in all resolutions.

But ckEditor's seem to exist for all later OC-Versions, I would try one of those, to
possibly solve your Problems.
Good Luck!
Ernie

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If it's not available paste the content to text based editor (notepad or vim), copy again and paste to editor in WYSIWYG mode.
The worse outcome each paragraph separated with <br> instead of wrapped in <p> tags; use view source to see it.